This short video shows you how to create a "Buy Now" button in PayPal.
Editing PayPal Buttons and Thank You Pages
This second video will show you how to edit your buttons and how to add advanced features such as thank you pages and page redirection on cancelled payments.
Both These videos are best seen on the full screen. Just click on the icon at the bottom right of the video (see image below).
To exit full screen just press escape